1 /* 2 * @(#)DeviceTables.cpp 1.5 00/03/15 3 * 4 * (C) Copyright IBM Corp. 1998 - 2006 - All Rights Reserved 5 * 6 */ 7 8 #include "LETypes.h" 9 #include "OpenTypeTables.h" 10 #include "DeviceTables.h" 11 #include "LESwaps.h" 12 13 U_NAMESPACE_BEGIN 14 15 const le_uint16 DeviceTable::fieldMasks[] = {0x0003, 0x000F, 0x00FF}; 16 const le_uint16 DeviceTable::fieldSignBits[] = {0x0002, 0x0008, 0x0080}; 17 const le_uint16 DeviceTable::fieldBits[] = { 2, 4, 8}; 18 19 #define FORMAT_COUNT LE_ARRAY_SIZE(fieldBits) 20 21 le_int16 DeviceTable::getAdjustment(le_uint16 ppem) const 22 { 23 le_uint16 start = SWAPW(startSize); 24 le_uint16 format = SWAPW(deltaFormat) - 1; 25 le_int16 result = 0; 26 27 if (ppem >= start && ppem <= SWAPW(endSize) && format < FORMAT_COUNT) { 28 le_uint16 sizeIndex = ppem - start; 29 le_uint16 bits = fieldBits[format]; 30 le_uint16 count = 16 / bits; 31 le_uint16 word = SWAPW(deltaValues[sizeIndex / count]); 32 le_uint16 fieldIndex = sizeIndex % count; 33 le_uint16 shift = 16 - (bits * (fieldIndex + 1)); 34 le_uint16 field = (word >> shift) & fieldMasks[format]; 35 36 result = field; 37 38 if ((field & fieldSignBits[format]) != 0) { 39 result |= ~ fieldMasks[format]; 40 } 41 } 42 43 return result; 44 } 45 46 U_NAMESPACE_END 47
